<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!--卡片视图区域-->
        <el-card >
            <!--警告区域-->
            <el-alert
                    title="注意：只允许为第三级分类设置相关参数！"
                    type="warning"
                    effect="dark" :closable="false" show-icon>
            </el-alert>
            <!--选择商品分类的区域-->
            <el-row class="cat_opt">
                <!--选择商品分类的级联选择框-->
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader
                            v-model="selectedCateKeys"
                            :options="catelist"
                            :props="cateProps" @change="handleChange">

                    </el-cascader>

                </el-col>

            </el-row>

            <!--tab页-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <el-table :data="manyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable style="margin-left: 8px;">
                                    {{item}}
                                </el-tag>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="序号"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <el-button type="primary" size="mini" icon="el-icocn-edit">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icocn-delete">删除</el-button>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <el-table :data="onlyTableData" border stripe>
                        <!--展开行-->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable style="margin-left: 8px;"
                                    @close="handleClose(i,scope.row)"
                                >
                                    {{item}}
                                </el-tag>
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button  v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加新标签</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="序号"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <el-button type="primary" size="mini" icon="el-icocn-edit">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icocn-delete">删除</el-button>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>


        </el-card>

        <!--添加参数的对话框-->
        <el-dialog
                :title="'添加' + titleText"
                :visible.sync="addDialogVisible"
                width="30%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" label-width="80px" ref="addFormRef">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
          return{
              //商品分类列表
              catelist:[],
              //级联选择框的配置对象
              cateProps:{
                  expandTrigger: 'hover',
                  value:'cat_id',
                  label:'cat_name',
                  children:'children',

              },
              //级联选择框的双向绑定数据
              selectedCateKeys:[],
              activeName: 'many',
              //动态参数数据
              manyTableData:[],
              //静态参数数据
              onlyTableData:[],
              //控制添加对话框的显示与隐藏
              addDialogVisible:false,
              addForm:{
                attr_name:''
              },
              addFormRules:{
                  attr_name:[
                      {required:true,message:'请输入参数名称',trigger:'blur'}
                  ]
              },

          }
        },
        created(){
            this.getCateList();
        },
        computed:{
            isBtnDisabled(){
                if (this.selectedCateKeys.length != 0){
                    return false;
                }

                return true;
            },
            //当前选中的分类id
            cateId(){
                return this.selectedCateKeys[this.selectedCateKeys.length-1];
                
            },
            //动态计算标题的文本
            titleText(){
                if (this.activeName=== 'many'){
                    return '动态参数'
                } else{
                    return '静态属性'
                }

            }
        },
        methods:{
            //获取所有的商品分类列表
            async getCateList(){
                const {data:res} = await this.$http.get('categories');
                if (res.meta.status !==200){
                    return this.$message.error('获取商品列表分类时报');
                }

                this.catelist = res.data;
                console.log(this.catelist);
            },
            //级联选择框选中项变化，会触发这个函数
            async handleChange(){
                this.getParamsData();
            },
            //tabs页面点击事件
            handleTabClick(){
                this.getParamsData();
            },

            //获取参数列表数据
            async getParamsData(){
                //根据所选分类的ID,和当前所处的面板，获取对饮的参数
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}});
                if (res.meta.status !==200){
                    return this.$message.error('获取参数列表失败！');
                }

                res.data.forEach(item=>{
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];

                    //控制文本的显示与隐藏
                    item.inputVisible = false;
                    //文本框输入的值
                    item.inputValue = ''

                })
                
                if (this.activeName === 'many'){
                    this.manyTableData =  res.data;
                }else{
                    this.onlyTableData = res.data;
                }
            },
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮，添加灿参数
            addParams(){
                this.$refs.addFormRef.validate(async valid=>{
                    if (!valid) return
                     const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })

                    if (res.meta.status !==201){
                        return this.$message.error('添加参数失败！');
                    }
                     this.$message.success('添加参数成功！');
                    this.addDialogVisible = false;

                    this.getParamsData();
                })
            },
            //文本框失去焦点或者按了enter键都会触发
            async handleInputConfirm(row){
                if(row.inputValue.trim().length === 0){
                    row.inputValue = ''
                    row.inputVisible = true
                    return;
                }

                //如果没有return，则说明输入了内容在做后续处理
                row.attr_vals.push(row.inputValue.trim());
                row.inputValue = '';
                row.inputVisible = false

                this.saveAttr(row);


            },
            async saveAttr(row){
                //发起请求，保存这次操作
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                })

                console.log(res);

                if (res.meta.status !==200){
                    return this.$message.error('修改参数项失败!');
                }

                this.$message.success('修改参数项成功!');
            },
            //点击
            showInput(row){
                row.inputVisible = true;
                //$nextTick 当页面上的元素被重新渲染才执行
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },

            //删除对应的参数可选项
            handleClose(i,row){
                row.attr_vals.splice(i,1);
                this.saveAttr(row);
            }





        }
    }
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0px;
    }
    .input-new-tag{
        width: 120px;
        margin-left: 8px;
    }
    .button-new-tag{
        margin-left: 8px;
    }


</style>